Piazza, Bagwell, Ortiz, Pudge, Biggio
Ortiz failed the same test that Bonds, Ramirez, Sosa, ARod, Manny, Grimsley, and Segui failed in 03. The other 6 guys are easily known users. Yet, Papi always got a pass because he was likable.
I think everyone knows Pudge did. When Canseco came out w/ his book he was vilified. Ironically, I think he might be one of the few honest people of the era. So when he says he personally injected Pudge, Palmeiro, and Juan Gonz, I believe him.
Bagwell and Piazza both have bizarre career jumps. Bagwell was a skinny 3B with 15 hr power who became friends with Caminiti, and turned into a monster who hit 40+ a year. Piazza was an afterthought, a favor draft pick who became the best hitting catcher in MLB history.
Biggio was named by a teammate as a user for a few years.